diff-highlight: fix a whitespace nit

This changes the indent from
  "<tab><sp><sp><sp><sp><sp><sp><sp><sp>"
to
  "<tab><tab>"
so that the statement lines up with the rest of the block.

Signed-off-by: Norman Rasmussen <[email protected]>
Acked-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: normanr

contrib/diff-highlight/DiffHighlight.pm

@@ -72,7 +72,7 @@ sub handle_line {
 	      (?:$COLOR?\|$COLOR?[ ])* # zero or more trailing "|"
 	                         [ ]*  # trailing whitespace for merges
 	    /x) {
-	        my $graph_prefix = $&;
+		my $graph_prefix = $&;
 
 		# We must flush before setting graph indent, since the
 		# new commit may be indented differently from what we